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Finding the Fourth Proportional to 654.80, 981.69 and 243.89

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Solution

The fourth proportional to 654.80, 981.69 and 243.89 is: 365.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.80 : 981.69 = 243.89 : x
  2. Step 2: Convert to fraction form
    654.80/981.69 = 243.89/x
  3. Step 3: Cross multiply
    654.80x = 981.69 × 243.89
  4. Step 4: Simplify right side
    654.80x = 239,419.47
  5. Step 5: Solve for x
    x = 239,419.47/654.80
  6. Step 6: Final answer
    x = 365.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.